WO2017161737A1

WO2017161737A1 - Television analog-signal demodulation method and device

Info

Publication number: WO2017161737A1
Application number: PCT/CN2016/088359
Authority: WO
Inventors: 薛金升
Original assignee: 乐视控股（北京）有限公司; 乐视致新电子科技（天津）有限公司
Priority date: 2016-03-22
Filing date: 2016-07-04
Publication date: 2017-09-28
Also published as: CN105847719A

Abstract

Provided are a television analog-signal demodulation method and device, said device comprising: a radio-frequency receiving module configured to receive a video signal, said video signal being an analog signal; an AD chip configured to convert said analog signal into a digital signal via analog-to-digital conversion and transmit said digital signal using a digital transport stream (TS); a USB bridge configured to convert said digital TS into a USB signal; a main IC configured to process said USB signal. In the present application, it is possible to process a video signal in analog-signal form, overcoming the defect in the prior art of supporting only digital-signal processing.

Description

Television analog signal demodulation method and device

The present application claims priority to Chinese Patent Application No. 201610165458.1, entitled "A TV Analog Signal Demodulation Method and Apparatus", filed on March 22, 2016, the entire contents of In this application.

Technical field

The embodiments of the present invention relate to the technical field of television chips, and in particular, to a television analog signal demodulation method and apparatus.

Background technique

In TV commercials, I often hear that "XX TV uses the XX engine". Is there a TV engine with the same components as the car engine? In fact, just like buying a computer, the CPU is the core component to measure the performance of the computer. The analogy seems to be equivalent to the "engine" of the computer. The TV also has its own "CPU". In addition to the LCD panel, the "CPU" of the TV is very important, because the main purpose of the TV is to develop color, and the processing of color is much stricter than that of the display. The final impact on the quality of TV images is the use of TV chips.

In the field of smart phones, Qualcomm is a typical representative of the performance of mobile phone processors. For smart TVs, the same system running Android, Qualcomm has entered the TV chip industry, and many manufacturers choose Qualcomm as a platform, but so far, Qualcomm platform itself does not support the modulation of RF signals.

In order to solve this problem, the crux of the problem is that the current USB (Universal Serial Bus) bridge can handle the digital code stream, and can also be converted into a USB signal for the main IC (Integrated Circuit) processing. Therefore, the existing improvement scheme usually adopts the method of adding an external tuner+demo to perform modulation and demodulation, and demodulates the signal and converts it into a USB signal through a chip to the main IC for processing. However, for analog signals, such as CVBS (Composite Video Broadcast Signal), which is widely used, the CVBS is a widely used standard, also called baseband video, which transmits data in analog waveforms. The composite video contains chromatic aberrations (hues). And saturation) and brightness (bright) information, and synchronize them in the blanking pulse, using the same signal.

Therefore, the existing improvements will at least bring the following problems:

1, can only support digital signals, such as domestic cable signals, users can only watch the number of devices Word channel, while analog channels and broadcast signals can not be used, causing a lot of inconvenience to users;

2. Most people still prefer to use a set-top box to watch TV, while the set-top box is connected to the AV (Audio Video, Audio and Video) port via a signal cable, where the CVBS signal cannot be viewed.

Summary of the invention

The embodiment of the present application provides a television analog signal demodulation method and apparatus, which can process a video signal in the form of an analog signal, thereby completely or partially overcoming the defects that the prior art can only support digital signal processing.

The embodiment of the present application provides a television analog signal demodulation apparatus, including:

a radio frequency receiving module configured to receive a video signal, where the video signal is an analog signal;

An AD chip configured to convert the analog signal into a digital signal by analog-to-digital conversion processing, and transmit the digital signal in a digital TS stream;

a USB bridge configured to convert the digital TS stream to a USB signal;

The main IC is configured to process the USB signal.

The embodiment of the present application provides a television analog signal demodulation method, including:

Receiving a video signal, the video signal being an analog signal;

Converting the analog signal into a digital signal through analog-to-digital conversion processing, and transmitting the digital signal in a digital TS stream;

Converting the digital TS stream to a USB signal and processing the USB signal.

The television analog signal demodulation method and device provided by the embodiments of the present application are processed into a corresponding TS stream through a TV tuner, a modem, and an AD chip after all analog signals are input, and the TS stream is converted into a USB bridge by analog-to-digital conversion. The digital signal that can be processed, that is, by converting the input analog signal into a digital signal and then processing the IC, solves the drawbacks of the prior art that the analog signal cannot be processed.

DRAWINGS

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief description of the drawings used in the embodiments or the prior art description will be briefly described below. Obviously, the drawings in the following description It is some embodiments of the present application, and those skilled in the art can obtain the same according to these drawings without any creative work. His drawings.

1 is a schematic structural diagram of a television analog signal demodulating apparatus according to an embodiment of the present application;

2 is a schematic diagram of converting a radio frequency signal to an intermediate frequency signal in an embodiment of the present application;

3 is a schematic diagram of a TS packet in a specific embodiment of the present application;

4 is a schematic diagram of TS flow formation in a specific embodiment of the present application;

5 is a schematic structural diagram of a television analog signal demodulating apparatus when an analog signal is a CVBS signal according to an embodiment of the present application;

FIG. 6 is a schematic flow chart of a television analog signal demodulation method in a specific embodiment of the present application.

detailed description

The technical solutions in the embodiments of the present application are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present application. It is a part of the embodiments of the present application, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present application without departing from the inventive scope are the scope of the present application.

1 is a schematic structural diagram of a television analog signal demodulating apparatus according to an embodiment of the present application. As shown in FIG. 1, the apparatus includes:

The radio frequency receiving module is configured to receive a video signal, where the video signal is an analog signal.

Specifically, the radio frequency receiving module receives the video signal in a wired transmission or a wireless transmission manner, and the video signal is an analog signal.

Wherein, the analog signal refers to information represented by a continuously varying physical quantity whose amplitude, or frequency, or phase of the signal changes continuously with time, such as a currently broadcasted sound signal, or an image signal.

The RF receiving module modulates the analog signal into a radio frequency signal (RF signal) and sends it to the TV tuner.

The television tuner is configured to receive the radio frequency signal transmitted by the radio frequency receiving module, and convert the radio frequency signal into an intermediate frequency signal and send the signal to the modem.

Specifically, the TV tuner may be a Tuner chip, and the Tuner chip receives the radio frequency signal transmitted from the radio frequency receiving module, and converts the radio frequency signal into an intermediate frequency signal.

As shown in Figure 2, the method of converting the RF signal to the IF signal can be based on:

IF=|Fo-Fs|,

Among them, IF is the intermediate frequency signal output from the TV tuner, Fo is the local oscillation signal, and Fs is the input RF signal.

The modem is configured to receive the intermediate frequency signal transmitted by the television tuner, and transmit and modulate the intermediate frequency signal to the AD chip.

Specifically, the modulation converts the digital baseband signal into a digitally modulated signal suitable for channel transmission, and the received digital frequency band signal is reduced to a digital baseband signal at the receiving end. In this embodiment, the modem demodulates the intermediate frequency signal, converts it to baseband, and decodes the encoded signal of the baseband.

The AD chip is configured to convert the modulated intermediate frequency signal into a digital signal through AD conversion processing, and transmit the digital signal to the USB bridge in the form of a digital TS (Transport Stream).

Specifically, the AD conversion is analog-to-digital conversion. In the present embodiment, the modulated intermediate frequency signal is converted into a digital signal, and the digital signal converted by the AD chip is transmitted to the USB bridge in the form of a digital TS stream.

As shown in FIG. 3, the TS packet is divided into a link header, an adaptation field, and a payload according to functions, wherein the length of the link header is fixed to 4 bytes, and the length of the adaptation field is variable from 0 bytes to 184 bytes. The length of the payload data is variable from 0 bytes to 184 bytes. The TS stream is formed by a periodic arrangement of a number of TS packets of length 188 bytes.

The TS stream generation process is as shown in FIG. 4. The video ES and the audio ES form a PES through a packetizer and a common or independent system time reference, and the formed transport stream is multiplexed by a TS multiplexer, where the ES stream (Elementary Stream) ) is a continuous code stream of basic code stream, audio, video or other information that is not segmented; PES (Program Elementary Stream) stream is a package basic that divides the elementary stream ES into segments and adds the corresponding header files. The code stream; then the TS stream is a single data stream that combines one or more PESs with a common time reference or an independent time reference.

The USB bridge is configured to receive the digital TS stream from the AD chip and convert the digital TS stream to a USB signal for transmission to the host IC.

Specifically, the USB bridge can process the digital code stream, convert the digital TS stream to a USB signal after receiving the digital TS stream, and then transmit the USB signal to the main IC for processing.

In the prior art, since only data signals can be supported, analog signals cannot be processed. In the embodiment of the present application, after all the analog signals are input, the TV tuner, the modem, and the AD chip are processed into corresponding TS streams, and the TS stream is subjected to analog-to-digital conversion to become a digital signal that can be processed by the USB bridge. That is to say, by converting the input analog signal into a digital signal and then processing the IC, the drawbacks of the prior art that the analog signal cannot be processed are solved.

In addition, an I2C bus (Inter-IC bus) connection is used between the TV tuner and the modem. The I2C bus is a bidirectional two-wire continuous bus that uses a data line (SDA) and a clock line (SCL) to complete data transfer and peripheral device expansion, thereby providing communication lines between integrated circuits (ICs). Widely used in televisions, video recorders and audio equipment.

As shown in FIG. 5, the television analog signal demodulating apparatus of the present application will be further described by taking the CVBS signal as an example.

The CVBS signal is an analog signal. The TV analog signal demodulation device receives the CVBS signal and inputs it to the AD chip. The AD chip converts the CVBS signal into a digital TS stream, which is transmitted to the USB bridge chip, processed by the USB bridge chip and transmitted to the main IC for processing. .

FIG. 6 is a schematic diagram of a method for demodulating a television analog signal according to an embodiment of the present application. As shown in FIG. 6, the method is applied to a television, and the method includes:

Step S61, receiving a video signal, where the video signal is an analog signal;

Step S62, converting the analog signal into a digital signal, and transmitting the digital signal in a digital TS stream;

Step S63, converting the digital TS stream into a USB signal, and processing the USB signal.

specifically,

The radio frequency receiving module receives the video signal, and the video signal is an analog signal;

The AD chip converts the analog signal into a digital signal through analog-to-digital conversion processing, and transmits the digital signal in a digital TS stream;

a USB bridge chip converts the digital TS stream into a USB signal;

The main IC processes the USB signal.

In addition, before the AD chip converts the analog signal into a digital signal, it may also include:

The RF receiving module receives the analog signal and modulates the analog signal into a radio frequency signal for transmission to the television tuner.

The TV tuner converts the RF signal to an intermediate frequency signal and sends it to the modem.

The modem transmits and modulates the intermediate frequency signal to the AD chip.

Specifically, the analog signal in this application is a CVBS signal.

The specific technical details of the television analog signal demodulation method of the embodiment of the present application are similar to those of the foregoing television analog signal demodulation apparatus, and thus are not described herein.

In the embodiment of the present application, after the analog signal is input, the TV tuner, the modem, and the AD chip are processed into corresponding TS streams, and the USB bridge processes the TS stream, converts it into a USB signal, and sends it to the main IC, thereby solving the prior art. Cannot handle the drawbacks of analog signals.

The device embodiments described above are merely illustrative, wherein the modules described as separate components may or may not be physically separate, and the components displayed as modules may or may not be physical modules, ie may be located A place, or it can be distributed to multiple network modules. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the embodiment. Those of ordinary skill in the art can understand and implement without deliberate labor.

Through the description of the above embodiments, those skilled in the art can clearly understand that the various embodiments can be implemented by means of software plus a necessary general hardware platform, and of course, by hardware. Based on such understanding, the above-described technical solutions may be embodied in the form of software products in essence or in the form of software products, which may be stored in a computer readable storage medium such as ROM/RAM, magnetic Discs, optical discs, etc., include instructions for causing a computer device (which may be a personal computer, server, or network device, etc.) to perform the methods described in various embodiments or portions of the embodiments.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present application, and not The present invention is described in detail with reference to the foregoing embodiments, and those skilled in the art should understand that the technical solutions described in the foregoing embodiments may be modified, or some of the technical features may be equivalent. The modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

A television analog signal demodulating device, comprising:

a radio frequency receiving module configured to receive a video signal, where the video signal is an analog signal;

An AD chip configured to convert the analog signal into a digital signal by analog-to-digital conversion processing, and transmit the digital signal in a digital TS stream;

a USB bridge configured to convert the digital TS stream to a USB signal;

The main IC is configured to process the USB signal.
The television analog signal demodulating apparatus according to claim 1, wherein the radio frequency receiving module modulates the received analog signal into a radio frequency signal.
The apparatus for demodulating a television analog signal according to claim 2, wherein the apparatus further comprises:

The television tuner is configured to receive the radio frequency signal transmitted by the radio frequency receiving module and convert the radio frequency signal into an intermediate frequency signal.
The apparatus for demodulating a television analog signal according to claim 3, wherein the apparatus further comprises:

And a modem configured to receive the intermediate frequency signal transmitted by the television tuner and transmit and modulate the intermediate frequency signal to the AD chip.
The television analog signal demodulating apparatus according to any one of claims 1 to 4, wherein the analog signal is a CVBS signal.
A television analog signal demodulation method, applied to a television, characterized in that:

Receiving a video signal, the video signal being an analog signal;

Converting the analog signal into a digital signal through analog-to-digital conversion processing, and transmitting the digital signal in a digital TS stream;

Converting the digital TS stream to a USB signal and processing the USB signal.
The television analog signal demodulation method according to claim 6, wherein the receiving the video signal is specifically: the radio frequency receiving module receives the video signal, and modulates the received analog signal into a radio frequency signal.
The method for demodulating a television analog signal according to claim 7, wherein the method further comprises:

The television tuner receives the radio frequency signal transmitted from the radio frequency receiving module and converts the radio frequency signal into an intermediate frequency signal.
The television analog signal demodulation method according to claim 8, wherein the method further comprises:

The modem receives the intermediate frequency signal from the television tuner and transmits and decodes the intermediate frequency signal to the AD chip.
The television analog signal demodulating method according to claim 9, wherein the AD chip converts the analog signal into a digital signal through analog-to-digital conversion processing, and transmits the digital signal in a digital TS stream; USB The bridge chip converts the digital TS stream into a USB signal; the master IC processes the USB signal.